A man scheduled to be tried Thursday in a domestic assault case has been charged with an unrelated second-degree murder, according to D.C. police.

Michael Marshall, 25, of Southeast, was already in jail when he was served with the murder warrant on Monday, court records show.

The new charges involve the Oct. 17, 2011 shooting death of 25-year-old Antonio Headspeth, who lived a few doors from the suspect in the Barry Farms community of Southeast.

D.C. police said officers responding to reports of gunfire about 1:30 a.m. found Headspeth behind a row of houses in the 1100 block of Stevens Road SE. He was pronounced dead on the scene, suffering from several gunshot wounds from a .40 caliber pistol, lying next to a chain link fence. Police said they recovered 13 spent shell casings.

Charging documents filed in D.C. Superior court do not give a motive for the killing, but they do say Marshall called Headspeth n his cell phone 20 minutes for the shooting.

A witness also told police that after the shooting, Marshall tried to hide the gun in his girlfriend’s grandmother’s house, according to the court papers. That witness, the documents say, led police to the a purse that was in a closet, and to the .40 caliber Glock.

Court documents show that Marshall was arrested on May 31 and charged with assault and possession of a handgun. He was ordered detained until his trial.

In that case, authorities said that he pushed and threatened a woman by pointing a black and silver handgun at her chest. The victim told police that he was upset because she remained friends with his ex-girlfriend, according to the court documents.

Keith L. Alexander contributed to this article.

This item has been updated.